Fire arch for furnaces



May 20, 1924. I 1,494,848

M. LIPTAK 1mm ARcH FOR FURNACES Filed Oct. 27. 1920 s Sheets-Sig 1 May 20 1924. 1,494,848

M. LIPTAK FIRE ARCH FOR FURNACES Filed Oct. 27 1920 3 Sheets-Sheet 2 l l l l l IIII II'IIII May 20 1924. 1,494,848

M. LIPTAK FIRE ARCH FOR FURNACES Filed Oct. 27, 192 3 Sheets-$heet 3 llnwwammm Patented May 20, 1924.

UNITED STATES PATENT mm.

MICHAEL LIPTAK, OF ST. PAUL, MINNESOTA, ASSIGNOR TO LIPTAII FIRE BRICK ARCH CO., OF MINNEAPOLIS, MINNESO TA, A CORPORATION OF MINNESOTA FIRE ARCH FOR FURNACES.

Application filed October 27, 1920. Serial No. 419,973.

To all whom it may concern:

Be it known that I, MICHAEL LIPTAK, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Fire Arches for Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to furnaces such as used in connection with boilers in steam generating plants, in steel plants, in

glass factories and various other places, and has for its object to provide an improved fire arch structure therefor.

Fire arches for furnaces may be generally classed as either of the double arch or of the single arch type. In the double arch type,

an upper layer of arch-forming blocks are' hung from suitable beams and lower or under-facing blocks are hung below the upper layer. This double arch type is exemplified, for example, in my prior United States Patent No. 1,326,752, of date December 30, 1919. The present invention is directed particularly to the improvement of the socalled single arch, and it consists, generally stated, of the novel devices and combinations of devices hereinafter described and defined in the claims.

Particularly, the invention is directed to certain features of improvement which make it an easy and simple matter to replace, at small cost, any one or more of the arch blocks without disturbing adjacent arch blocks.

The ability to readily replace the arch blocks individually is of the utmost importance, because, in practice, some of the blocks will be burned away and require replacement while many or probably most of the arch blocks are in such good condition as not to require replacement. In the customary construction, the arch blocks are supported and a plied in such a way that the replacement of one block, unless it be at the end of a row or series, will require the removal of many blocks that are in such good condition that they will last for a long time if not disturbed, but if removed, will usually be so damaged that'they will have to be replacedby new blocks.

The invention, however, involves certain other important and novel features of con-- to, are illustrated in the acompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Flg. 1 is a vertical section taken centrally through the fire arch and associated parts of the furnace, some parts being diagrammatically illustrated, some parts being shown in full and some parts being broken away;

Fig. 2 is a fragmentary transverse section taken on the line 2-2 of Fig. 1;

' Fig. 3 is a fragmentary perspective showlng the improved fire arch in position in the furnace;

Fig. 4 is a fragmentary transverse section on the line 44 of Fig. 1;

Fig. 5 is a perspective showin two of the crown blocks of the arch, assemb ed together but removed from the arch; I

Fig. 6 is a perspective showing one of the arch-forming blocks;

Fig. 7 is a perspective showing a plurality of arch-forming blocks properly assembled together but removed from the arch, positions of certain of the beams being inclicated by dotted lines;

Fig. 8 is a detail in section taken approximately on the line 88 of Fig. 3, some parts being shown in full and some parts being broken away;

Fig. 9 is a fragmentary detail in transverse section illustrating a slightly modified form of the arch block illustrated in the views above described; v t .i

Fig. 10 is a fragmentary plan View of a portion of the arch illustrating a modified form of the arch-forming blocks and block hangers;

Fig. 11 is a perspective view showing a plurality of the blocks illustrated in Fig. 10, prolperly assembled but removed from the arc Fig. 12 is a section taken on the line 1212 of Fig. 10;

Fig. 13 is a fragmentary sectional perspective illustrating the manner in which the block hangers, shown in Figs. 10 and 12, are hung from the supporting beams of the arch;

Fig. 14 is a view corresponding to Fig.

-their depending or lower portions.

12, but illustrating a slightly modified form of block and hanger; and

Fig. 15 is a perspective illustratin a slightly modified form of the arch b ock illustrated in Figs. 10, 11 and 12.

The masonry walls of the furnace are in dicated by the numeral 16, and in the construction illustrated, the furnace has grates 17 and fuel ports 18, which latter open through the lower portion of the front wall 19.

The arch construction illustrated in Figs. 1 to 8, inclusive, will first be described. The

fire arch is supported from the transverse main beams 20, as shown three in number, and preferably in the form of I-beams, the ends of which are imbedded in the masonry side walls. Slidably hung on the lower flanges of the main beams 20 are beam hangers 21 having inturned upper prongs that embrace the lower flanges of said beams, and having T-shaped channels 22min e contracted portions of the channels 22 are formed above inwardly projected bosses 23, and said channels extend in a direction from front to rear of the arch.

The hangers 21 are aligned on the several main beams 20, so that short longitudinally spaced upper flanges 24, of laterally spaced supplemental beams 25, are adapted to be slid into the channels 22 and rested on the bosses 23 of the aligned beam hangers 21. By the bosses 23, the supplemental beams 25 can be supported either in oblique or horizontal positions, depending on whether or not the main beams 20 are located one higher than the other. As shown, the beams 25 incline forwardly or toward the ignition arch 19. The supplemental beams 25. and beam hangers 21 are preferably of cast iron, while the main beams 20 may be commercial rolled steel or iron beams. At their lower edges, the supplemental beams 25 have outstanding flanges extending the full length thereof. The main body portions 26 of the arch-forming blocks are rectangular structures and, as illustrated in Figs. 1 to 8, inclusive, these blocks have rectangular head portions 26 that are shorter and narrower than the bodies of the blocks and, as here illustrated, are flush with one corner of the block. The heads 26* are undercut or grooved at 26 so that they will receive block hangers in the form of short flat metal bars 27. These bars 27 are of such length that they will rest on the opposing lower flanges of adjacent supplemental beams 25, (see Figs. 1, 2 and 8), and they are of such width or transverse dimensions that they can he slid or moved laterally to and from working positions within the grooves 26 and under the overhanging portions of the heads 26". Thus, the blocks 26 are independently supported so that any aeeaeae one block can be removed or applied independently of adjacent blocks and without disturbing or moving the latter.

With the above described arrangement of heads 26 oflset toward one side of the respective blocks, it is possible, by placing the blocks of adjacent transverse rows back to back with their heads aligned, to offset the body portions of said blocks so that broken or staggered joints will be formed between the blocks of adjacent rows. This is important because, in a forward and rearward direction or in a direction in which the flame travels under the arch, the arch is formed without any continuous joints through which the flames might sweep and thereby more rapidly burn away the blocks.

At their inner ends, the supplemental beams 25 are preferably provided with detachable beam tips or extensions 28, which, as preferably constructed, have lower and upper flanges which, in cross section, are like those of the said supplemental "beams. These beam tips 28, however, are provided with T-shaped end flanges 28 that slide into correspondingly formed seats in forwardly extended sockets 29 of the said supplemental beams, (see Figs. 3 and 8). Some of the block hangers 27 rest on the'lower flanges of these beam tips 28.

To finish the inner end of the arch, I provide so-called crown blocks 30, which, in the upper portions of their sides, have grooves 30 that form overhanging ledges 30 adapted to rest on the lower flanges of the beam tips. These grooves 30, however, do not extend through to the front faces of the said crown blocks and, hence, said crown blocks protect the ends of the beam tips from the action of flames that sweep under and then upward against said crown blocks.

Metallic apron-supporting plates 31 are placed on the upper flanges of the beam tips and these plates support at least a portion of an apron wall 32, which, as shown, is built thereon and on the innermost main beam 20.

With the construction just described, it is evident that the crown blocks 30 can be slid onto and off from the flanges of the beam tips, under the apron wall supportin plates 31 and, hence, without disturbing sai apron wall. By reference particularly to Figs. 1, 3 and 5, it will be noted that the crown blocks 30, at the tops of their front portions, have flat raised ribs 30 that closely engage the lower portion of the apron wall inward of the apron supporting plates 31 and, hence, protect these metallic plates 31 from the flames.

It will be further noted that the sides of the crown blocks 30 are formed with horizontal ribs or corrugations 30 that follow parallel wave lines, and that these wave lines project equally both inward and outward of imaginery medial lines drawn vertically between the upper and lower extremities of said wave lines. This not only keeps said corner blocks of constant horizontal transverse dimensions and, hence, the same strength throughout, but reduces the liability of cracking and dropping off of the lower corner portions of said blocks.

The beams 25 may be made in sections and connected by telescoped flanges and sockets 29 substantially as are the beams and beam tips.

The constructionillustrated in Fig. 9 is like that above described, except that the heads 26 are centrally located on the arch blocks 26, so that the joints between the blocks will be aligned and not staggered or broken as illustrated in the views above described in detail.

The arch blocks 26, illustrated in Figs. 10, 11 and 12, are designed for use in connection with block'hangers illustrated in Figs. 10, 12 and 13, and, hence, their head portions 26 are made of reduced thickness from front to rear of the arch and are formed with inverted T-shaped channels or pockets 26.

The blockhangers used with these blocks each comprises a bar 27" having an inverted depending T-shaped portion 27 that is adapted to enter into interlocking engagement with the co-operating channel or pocket 26, by lateral sliding movement of said hanger on the flanges of the supporting beams 25. The clearance spaces afforded by reduced width of the heads 26 permits the T-shaped portions 27 to be brought to position in alignment with the respective channels or pockets 26, so that these blocks also may be individually removed from and applied in working positions in the arch. W1th the channels or pockets 26 offset from the centers of the blocks, as shown in Figs. 10, 11 and 12, the blocks of the arch will be hung with offset or broken joints.

The construction illustrated in Fig. 14 is like that illustrated in Figs. 10, 11 and 12, except that the T-shaped channels 26' are there located at the transverse centers of the blocks so that the blocks in the arch will be hung with aligned and not with broken or staggered joints.

The block illustrated in Fig. 15 is like that illustrated in Figs. 11 and 14, in that it is provided with an inverted T-shaped channel or pocket 26, but this block, Fig. 15, is left with all corners intact and the entrance to the T-shaped pocket 27, of the hanger 27 is afforded simply by a clearance notch 26*.

What I claim is:

1. A furnace arch comprising supporting beams, arch-formin blocks, and block han ers supported by sai beams and individualfy supporting said blocks below said beams, sa1 blocks being set with broken or staggered joints in a direction from front to rear of the arch.

2. A furnace arch comprising supporting beams, arch-forming blocks supported from and below the same, and crown blocks detachably supported by the inner ends of said beams, said crown blocks having contacting faces formed with horizontal corrugations that project equally inward and outward from imaginery medial lines.

3. A furnace arch comprising supporting beams, arch-forming blocks, block hangers, said blocks having heads that are undercut at one side, said hangers engaging the undercut heads of said blocks and individually supporting the same from said beams with the blocks of adjacent transverse rows placed back to back, the blocks in adjacent rows being transversely offset so as to form broken joints longitudinally of the arch, and crown blocks supported by the inner ends of said beams and forming the inner edge of the arch, the joints between the crown blocks being oflset from the joints between the arch blocks of the adjacent row thereof.

t. A furnace arch comprising supporting beams, arch-forming blocks having inverte approximately T-shaped head channels, and block hangers having inverted approximately T-shaped depending heads that are engageable and disengageable with the head channels of said blocks, by lateral movement of said hangers on said beams, the headchannels of said blocks being nearer to one ed e than to the other of said blocks, and the locks of adjacent rows being set back to back so as to break or stagger joints between the blocks of adjacent rows.

In testimony whereof I aflix my signature.

MICHAEL LIPTAK. 

